Having lurked on here for a while, I thought it time to post something.
A while ago a group of us built a copy of a Sussex Barn, 40 foot long by
12 foot wide, from scratch, starting by felling the trees - mainly Oak with a bit of Ash.
3 foot diameter Oak is a bit heavy. Takes about 10 minutes with a few wedges and a couple of lump hammers. Initially, we used a chainsaw mill to cut the timber we needed but it was taking too long so we hired a man and his mobile sawmill - brilliant piece of kit. Took him 10 minutes to do what took us 5 hours.
Phil